/*
** EPITECH PROJECT, 2026
** rush1-3.c
** File description:
** bleh
*/

#include <unistd.h>

void my_putchar(char c)
{
    write(1, &c, 1);
}

static int print_corner(int x, int y, int i, int j)
{
    if (i == 0 && j == 0) {
        my_putchar('A');
        return 1;
    }
    if (i == 0 && j == x - 1) {
        my_putchar('C');
        return 1;
    }
    if (i == y - 1 && j == 0) {
        my_putchar('C');
        return 1;
    }
    if (i == y - 1 && j == x - 1) {
        my_putchar('A');
        return 1;
    }
    return 0;
}

static void print_char(int x, int y, int i, int j)
{
    if (x == 1 || y == 1) {
        my_putchar('B');
        return;
    }
    if (print_corner(x, y, i, j))
        return;
    if (i == 0 || i == y - 1 || j == 0 || j == x - 1) {
        my_putchar('B');
    } else {
        my_putchar(' ');
    }
}

void rush(int x, int y)
{
    if (x <= 0 || y <= 0) {
        write(2, "Invalid size\n", 13);
        return;
    }
    for (int i = 0; i < y; i++) {
        for (int j = 0; j < x; j++) {
            print_char(x, y, i, j);
        }
        my_putchar('\n');
    }
}

int main()
{
    rush(4, 4);
    return 0;
}